Web client hanging forever

[yadid]

Im trying to run flower on my local celery deployment. When I try to connect via web browser to localhost:5555 or via curl , it just hangs forever (waiting for localhost). I can telnet to port 5555, but other than that no response. Below is some debug info:

celery -A myproject flower --broker=redis://localhost:6379/0 --broker_api=redis://localhost:6379/0 --debug --inspect_timeout=10
[I 161120 20:08:01 command:136] Visit me at http://localhost:5555
[I 161120 20:08:01 command:141] Broker: redis://localhost:6379/0
[I 161120 20:08:01 command:144] Registered tasks:
[u'app.tasks.generate_scheduled',
u'celery.accumulate',
u'celery.backend_cleanup',
u'celery.chain',
u'celery.chord',
u'celery.chord_unlock',
u'celery.chunks',
u'celery.group',
u'celery.map',
u'celery.starmap',
u'app.tasks.generate_result',
'normalize_time_task',
u'myplatform.celery.debug_task',
u'tasks.bake_block',
'tasks.baker',
'tasks.mailman']
[D 161120 20:08:01 command:146] Settings: {'cookie_secret': 'pnKuJkmuRPW43p1N4KYmvRAZjwFJtE+dvDWUNGrHTl8=',
'debug': True,
'login_url': '/login',
'static_path': '/usr/local/lib/python2.7/site-packages/flower-0.9.1-py2.7.egg/flower/static',
'static_url_prefix': '/static/',
'template_path': '/usr/local/lib/python2.7/site-packages/flower-0.9.1-py2.7.egg/flower/templates'}
[D 161120 20:08:01 control:29] Updating all worker's cache...
[I 161120 20:08:01 mixins:224] Connected to redis://localhost:6379/0

[toorsukhmeet]

Having the same issue with RabbitMQ broker. Workers work as expected but flower (0.9.1) hangs.

[thenewguy]

I have recently started observing this as well and have not been able to track down what started the issue

[thenewguy]

Master did not fix the issue

[thenewguy]

My problem was ssl connection problems. Unrelated to flower... was a certificates permissions error on the filesystem

[enriquefernandez]

I'm having the same issue with Redis in OSX El Capitan.

Going to: http://localhost:5555/ hangs. It doesn't display anything.
In the terminal, flower doesn't complain about anything. It seems to start normally and it even displays the correct names of the registered tasks.

[philejmath]

I've having the same issue. Flower hanging indefinitely. Seems to start normally and displays all registered task.

[Jahangir-Sh]

Same issue, hangs forever. There is nothing descriptive logs on debug mode --debug.
Broker is Redis, celery worker runs locally, tasks are registered successfully. When installed worked as expected then appeared hanging, reinstalled, on changes.

[kellanburket]

I ran into this issue while using Redis Sentinel to connect to Flower. Celery couldn't resolve a DNS name I passed in but Flower didn't display an error message. It would hang when I tried to connect to it. It's extremely frustrating that there's no error message when Flower fails to connect to its broker and it's unclear to me why this failure results in an inability to set up the web client.

Here's my start up log:

python3.5 -m celery flower --port=5555 --address=0.0.0.0 --app=app --loglevel=INFO
INFO:flower.command:Visit me at http://0.0.0.0:5555
INFO:flower.command:Broker: redis-sentinel://redis-sentinel:16379/0
INFO:flower.command:Registered tasks:
['app.tasks.do_archive_elasticsearch_index_task',
'app.tasks.do_close_elasticsearch_index_task',
'celery.accumulate',
'celery.backend_cleanup',
'celery.chain',
'celery.chord',
'celery.chord_unlock',
'celery.chunks',
'celery.group',
'celery.map',
'celery.starmap']

[MegacoderKim]

Every time i have experienced this is usually a celery config issue with the log suppressed by flower.
try invoking the worker alone and see if the logs give any leads
celery -A app worker --loglevel=inf0

[ocervell]

Same issue here ... Happened after I switched to eventlet or gevent to run my tasks.

[senyuuri]

I'm having the same issue here.

If you are using WSL/Bash on Windows, this might be a result of a known compatibility issue between amqp 2.1.1 - 2.2.2 and WSL. (It's fixed in amqp 2.2.3 which has not been released at this moment of writing.)

In my case, I was using celery==4.1.0 and amqp==2.1.1. Everything was working fine. However, if I install flower through
pip install flower, run celery -A myprojectname flower and open http:\\localhost:5555 in the browser, the page just hangs.

I quickly ran a pip freeze and noticed my amqp version was replace with the current latest 2.2.2. Reinstalling an older version of amqp simply solves the issue. http:\\localhost:5555 now correctly shows the flower dashboard.

Hope this can help.

[djlambert]

Just ran into this issue. I added the following lines to the beginning of my Flask app to fix an issue with websockets.

import eventlet
eventlet.monkey_patch()

Commenting this out resolved the issue with Flower, so as @ocervell mentioned eventlet is involved somehome. Will need to find a workaround.

Update: Downgrading amqp to 2.1.1 did not resolve the issue.
Update 2: Starting Flower without specifying the app worked.

[gwsampso]

Having similar problems with
apache-airflow==1.9.0
amqp==1.4.9
celery==3.1.25
flower==0.9.2

[shashankkr9]

I encountered similar problem as well with:
amqp==2.2.2
celery==4.1.0
flower==0.9.2
kombu==4.1.0

[mberacochea]

Same issue:

flower==0.9.2
celery==4.1.1
amqp==2.3.1
kombu==4.2.0